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Contract and Other Receivables, Net - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, allowance for doubtful accounts $ 100,000   $ 100,000   $ 100,000
Bad debt expenses 55,290 30,000 55,290 90,000  
Accounts receivable retainage associated with construction projects 800,000   800,000   200,000
Percentage of revenues from major customers 46.00% 42.00% 41.00% 42.00%  
Revenue from major customers description The Company earned approximately 46% and 42% of its revenue from two customers for both the three months ended June 30, 2012 and 2011. The Company earned approximately 41% and 42% of its revenue from one and two customers for the six months ended June 30, 2012 and 2011, respectively The Company earned approximately 46% and 42% of its revenue from two customers for both the three months ended June 30, 2012 and 2011. The Company earned approximately 41% and 42% of its revenue from one and two customers for the six months ended June 30, 2012 and 2011, respectively The Company earned approximately 46% and 42% of its revenue from two customers for both the three months ended June 30, 2012 and 2011. The Company earned approximately 41% and 42% of its revenue from one and two customers for the six months ended June 30, 2012 and 2011, respectively The Company earned approximately 46% and 42% of its revenue from two customers for both the three months ended June 30, 2012 and 2011. The Company earned approximately 41% and 42% of its revenue from one and two customers for the six months ended June 30, 2012 and 2011, respectively  
Bonds outstanding 17,900,000   17,900,000   17,900,000
Additional customer purchased in 2010
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of revenues from major customers   41.00%   41.00%  
Number of customers   2   2  
Two customers
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable from major customers $ 4,600,000   $ 4,600,000   $ 700,000